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<li class="level1"><a href="#running-the-example">运行该示例</a></li>
<li class="level1"><a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qtquick-mousearea-example.html#mousearea-behavior">鼠标区域行为</a></li>
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<h1 class="title">Qt Quick 示例 - MouseArea</h1>
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<p>这是QML中<a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qml-qtquick-mousearea.html">MouseArea</a>类型的示例。</p>
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<p class="centerAlign"><img src="images/qml-mousearea-example.png" alt="" /></p><p><i>MouseArea</i> 
	示例展示了如何使用<a href="qml-qtquick-mousearea.html">MouseArea</a>响应点击和拖动。有关更多信息，请访问<a href="qtquick-input-topic.html">Qt 
	Quick 中的重要概念 - 用户输入章节</a>。</p>
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<h2 id="running-the-example">运行该示例</h2>
<p>要从 <a href="http://doc.qt.io/qtcreator/index.html">Qt Creator</a>运行示例，请打开<b>欢迎</b> 模式并从 <b>示例</b>中选择示例。有关更多信息，请访问<a href="http://doc.qt.io/qtcreator/creator-build-example-application.html">构建和运行示例</a>。</p>
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<h2 id="mousearea-behavior">鼠标区域行为</h2>
<p>当您在红色方块内单击时，<a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qml-qtquick-text.html">文本</a>类型将列出该单击的几个属性，这些属性可用于 QML。<a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qml-qtquick-mousearea.html">按下鼠标并保持在MouseArea</a>内时，红色方块的不透明度将降低。</p>
<p>当鼠标区域内发生点击或其他离散操作时，<a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qml-qtquick-mousearea.html">鼠标</a>区域会发出信号。</p>
<pre class="qml">

  <span class="name">onPressAndHold</span>: <span class="name">btn</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">'Press and hold'</span>
  <span class="name">onClicked</span>: <span class="name">btn</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">'Clicked (wasHeld='</span> <span class="operator">+</span> <span class="name">mouse</span>.<span class="name">wasHeld</span> <span class="operator">+</span> <span class="string">')'</span>
  <span class="name">onDoubleClicked</span>: <span class="name">btn</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">'Double clicked'</span>

</pre>
<p><a href="file:///E:/WLL/work/Qt5.12-Document-Trans-in-Chinese/qtquick/qml-qtquick-mousearea.html">MouseArea</a>也可用于拖动项目。通过设置拖动属性的参数，如果用户开始在鼠标区域边界内拖动，目标项将被拖动。</p>
<pre class="qml">

  <span class="name">drag</span>.target: <span class="name">blueSquare</span>
  <span class="name">drag</span>.axis: <span class="name">Drag</span>.<span class="name">XAndYAxis</span>
  <span class="name">drag</span>.minimumX: <span class="number">0</span>
  <span class="name">drag</span>.maximumX: <span class="name">box</span>.<span class="name">width</span> <span class="operator">-</span> <span class="name">parent</span>.<span class="name">width</span>
  <span class="name">drag</span>.minimumY: <span class="number">0</span>
  <span class="name">drag</span>.maximumY: <span class="name">box</span>.<span class="name">height</span> <span class="operator">-</span> <span class="name">parent</span>.<span class="name">width</span>

</pre>
<p>文件：</p>
<ul>
<li><a href="qtquick-mousearea-main-cpp.html">mousearea/main.cpp</a></li>
<li><a href="qtquick-mousearea-mousearea-wheel-example-qml.html">mousearea/mousearea-wheel-example.qml</a></li>
<li><a href="qtquick-mousearea-mousearea-pro.html">mousearea/mousearea.pro</a></li>
<li><a href="qtquick-mousearea-mousearea-qml.html">mousearea/mousearea.qml</a></li>
<li><a href="qtquick-mousearea-mousearea-qmlproject.html">mousearea/mousearea.qmlproject</a></li>
<li><a href="qtquick-mousearea-mousearea-qrc.html">mousearea/mousearea.qrc</a></li>
</ul>
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